/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.protocol.rsvp.parser.impl.subobject.ero;

import static com.google.common.base.Preconditions.checkArgument;
import static org.opendaylight.protocol.rsvp.parser.spi.subobjects.PathKeyUtils.parsePathKey;
import static org.opendaylight.protocol.rsvp.parser.spi.subobjects.PathKeyUtils.serializePathKey;

import io.netty.buffer.ByteBuf;
import org.opendaylight.protocol.rsvp.parser.spi.EROSubobjectParser;
import org.opendaylight.protocol.rsvp.parser.spi.EROSubobjectSerializer;
import org.opendaylight.protocol.rsvp.parser.spi.EROSubobjectUtil;
import org.opendaylight.protocol.rsvp.parser.spi.RSVPParsingException;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.explicit.route.subobjects.list.SubobjectContainer;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.explicit.route.subobjects.list.SubobjectContainerBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.explicit.route.subobjects.subobject.type.PathKeyCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.explicit.route.subobjects.subobject.type.PathKeyCaseBuilder;

/**
 * Parser for {PathKey}.
 */
public class EROPathKey32SubobjectParser implements EROSubobjectParser, EROSubobjectSerializer {
    public static final int TYPE = 64;

    private static final int PCE_ID_F_LENGTH = 4;
    private static final int CONTENT_LENGTH = 2 + PCE_ID_F_LENGTH;

    @Override
    public SubobjectContainer parseSubobject(final ByteBuf buffer, final boolean loose) throws RSVPParsingException {
        checkArgument(buffer != null && buffer.isReadable(), "Array of bytes is mandatory. Can't be null or empty.");
        if (buffer.readableBytes() != CONTENT_LENGTH) {
            throw new RSVPParsingException("Wrong length of array of bytes. Passed: " + buffer.readableBytes() + "; "
                + "Expected: >" + CONTENT_LENGTH + ".");
        }

        final SubobjectContainerBuilder builder = new SubobjectContainerBuilder();
        builder.setLoose(loose);
        builder.setSubobjectType(new PathKeyCaseBuilder().setPathKey(parsePathKey(PCE_ID_F_LENGTH, buffer)).build());
        return builder.build();
    }

    @Override
    public void serializeSubobject(final SubobjectContainer subobject, final ByteBuf buffer) {
        checkArgument(subobject.getSubobjectType() instanceof PathKeyCase,
            "Unknown subobject instance.Passed %s. Needed PathKey.", subobject.getSubobjectType().getClass());
        final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev150820.explicit.route
            .subobjects.subobject.type.path.key._case.PathKey pk = ((PathKeyCase) subobject.getSubobjectType())
            .getPathKey();
        final ByteBuf body = serializePathKey(pk);
        if (pk.getPceId().getValue().length == PCE_ID_F_LENGTH) {
            EROSubobjectUtil.formatSubobject(TYPE, subobject.isLoose(), body, buffer);
        } else if (pk.getPceId().getValue().length == EROPathKey128SubobjectParser.PCE128_ID_F_LENGTH) {
            EROSubobjectUtil.formatSubobject(EROPathKey128SubobjectParser.TYPE, subobject.isLoose(), body, buffer);
        }
    }
}
